ButtonBar+ Backup/Restore is a very useful package that includes two Automator actions: ButtonBar+ Backup and ButtonBar+ Restore. The first allows you to quickly backup your bookmarks using a user defined name.

ButtonBar+ Restore allows you to browse your entire backups list and you can easily restore any of them whenever you want.

ButtonBar+ is a Safari extension that gives you the possibility to access your favorite websites via a second, customizable bookmarks bar.